US6829866B2 - Wooden beams with sections that are subjected to transversal tension - Google Patents

Wooden beams with sections that are subjected to transversal tension Download PDF

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Publication number
US6829866B2
US6829866B2 US10/239,265 US23926502A US6829866B2 US 6829866 B2 US6829866 B2 US 6829866B2 US 23926502 A US23926502 A US 23926502A US 6829866 B2 US6829866 B2 US 6829866B2
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Prior art keywords
screws
subjected
transverse tension
height
zone
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Expired - Fee Related
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US10/239,265
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US20030029128A1 (en
Inventor
Paul Mattle
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SFS Group International AG
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SFS Intec Holding AG
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood
    • E04B1/2604—Connections specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood
    • E04B1/2604—Connections specially adapted therefor
    • E04B2001/262—Connection node with interlocking of specially shaped wooden members, e.g. puzzle type connection
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood
    • E04B1/2604—Connections specially adapted therefor
    • E04B2001/2652—Details of nailing, screwing, or bolting
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood

Definitions

  • the invention relates to a wooden beam having sections which are subjected to transverse tension, which are reinforced by rod-shaped elements which are positioned to extend essentially transversely to its longitudinal direction.
  • rod-shaped elements for special reinforcement.
  • these rod-shaped elements were glued into pre-drilled holes. This yielded a certain amount of beam strengthening transversely to its longitudinal direction, i.e. transversely to the grain orientation.
  • the premise is that the drill holes provided for the insertion of the rod-shaped elements heretofore normally extended over the entire height of a beam, or were provided at least starting at the top or at the bottom of the beam until well beyond the section that was actually subjected to transverse tension.
  • this causes a corresponding consumption of time for creating the drill hole, for inserting the rod-shaped element and for gluing it in, and on the other hand, there results an exceptional consumption of materials through correspondingly long rod-shaped elements and a correspondingly large required quantity of adhesive.
  • the present invention has as its objective to substantially improve the reinforcement possibilities for a beam of the initially described variety in the region of sections subjected to transverse tension.
  • a preferred embodiment is one in which the screws extend approximately equally far above and below a zone of increased transverse tension. This ensures that the thread portions which are present at both ends of the screw provide adequate anchoring to essentially equal degrees, so that the transverse tension forces can be absorbed without any problems. However, such an arrangement becomes possible only if the screws can be screwed into the wooden beam less deeply or even more deeply, as appropriate.
  • the length of the screws be chosen shorter than one half the height of the beam. Especially for beams of exceptional height this yields a very substantial saving of material and furthermore, especially when using screws with threaded sections, there occurs the lowest possible insertion turning moment. Such screws can be screwed into the wood beam without predrilling a hole, which also makes possible an appropriately deep insertion.
  • the inventive technique can also be used advantageously, namely by screwing into sections subjected to transverse tension two or more screws spaced apart and approximately parallel to each other and axially displaced over the height of the beam.
  • a relatively large segment of a beam can be provided with exceptional transverse tension reinforcement, namely through the screwing in of a multiplicity of screws which are screwed in from the top or the bottom side of the beam and in so doing are screwed in more or less far.
  • a preferred embodiment provides that the screws are equipped with a thread over their entire shaft length. This ensures that the screws can engage the wood of the beam over their whole length and are therefore capable of absorbing relatively high transverse tension forces.
  • the screws have an internal tool drive at their one end, with the diameter of the segment of the screws which surrounds this internal tool drive being made approximately equal to or only slightly greater than the outer diameter of the thread. In this way, it becomes possible to screw the screw in relatively deeply without significant increase of the screwing-in moment and without damage to the threaded region inside the wood. In this way, it also becomes possible to screw the screws in very deeply so as to bring them to just that point where the sections subjected to transverse tension are present.
  • a preferred and very simple procedure for screwing the screws into the wood beam exists if the screws are screwed in with a screwdriver bit having a shaft adjoining the screw-engaging region, or an imaginary cylinder enclosing the shaft, which has a diameter that is equal to or smaller than the diameter of the portion of the screw which surrounds the internal tool drive and which has a length sufficient to bridge the region of the height of the beam from the internal tool drive of the screw all the way to the upper or lower limit, and beyond to the screwdriver engagement point.
  • a relatively long screwdriver bit the screws can be screwed to the desired depth into the wood beam. Without requiring pre-drilling, there is therefore created the possibility to place the screw at the appropriate location relative to the height of the beam.
  • FIG. 1 a segment of a curved wood beam in cross-section, illustrating different segments subjected to transverse tension
  • FIG. 2 an enlarged illustration of a section from the beam according to FIG. 1 and illustrating a through-hole
  • FIG. 3 an enlarged illustration of an end region of a beam having a notch
  • FIG. 4 to FIG. 8 various embodiments and portions of wood beams, in particular showing sections subjected to transverse tension.
  • a wood beam 1 there exists a series of zones 2 subjected to transverse tension, which extend substantially in the lengthwise direction of the beam 1 , i.e. in the grain orientation of the wood. Whether the entire cross-section of this beam is formed of solid wood or of laminated wood, i.e. as a glued laminate, has practically no influence upon the behavior of sections subjected to transverse tension, because transverse tension is always present in the region of cutouts or through-holes 3 as well as in other regions.
  • a screw 4 is now to be screwed directly into the entire material of beam 1 .
  • These screws 4 which are to be used here have threaded segments at least at both of their end regions. However, it is also possible to provide a thread over the entire shaft length of the screws 4 .
  • the length L of the screws 4 is less than one half the height H of the beam 1 .
  • the screws 4 are placed precisely at the zone subjected to transverse tension. After screws 4 are screwed in from the top side 5 or from the bottom side 6 of the beam 1 , the screws 4 are screwed in so far that they are located immediately adjacent to the zone 2 subjected to transverse tension. From FIGS. 1 to 3 it can also be seen that the screws 4 preferably extend approximately equally far above and below such a zone 2 . This enables optimum absorption of the transverse tension forces by the regions of beam 1 adjacent to the respective zones 2 .
  • screws 4 can also be screwed in co-axially from opposite sides, i.e. from the topside 5 and bottomside 6 of beam 1 , if the screws are to extend over a correspondingly larger region of the height H of beam 1 .
  • the screws have an internal tool drive at one of their ends, the diameter of the section of screws 4 which surrounds the internal tool drive being as large as, or only slightly larger than the outer diameter of the thread. This makes possible relatively easy screwing in of screws 4 into this relatively deeply sunk in position since the large “head” of the screw does not create a significant increase in turning moment during screwing in of screws 4 .
  • the screwing in of screws 4 into this relatively deeply sunk-in position can be accomplished in simple manner with an appropriate screwdriver bit whose shaft adjoining the engagement region for applying to the screw, or an imaginary cylinder enclosing the shaft, has a diameter which is equal to or smaller than the diameter of the section of screw 4 surrounding the internal tool drive.
  • This screwdriver bit is long enough to bridge the portion of the beam height H from the internal tool drive of screw 4 to the upper or lower limit 5 or 6 of the beam 1 , and beyond to the screwdriver engagement point.
  • the screwdriver bit could be provided, for example, with indentations, color markings or the like.
  • sections subjected to transverse tension also occur at various segments of the beam 1 and therefore also very specific zones 2 subjected to transverse tension.
  • zones 2 subjected to transverse tension exist in the middle region of the length of curved beams 1 .
  • zones 2 subjected to transverse tension occur in beams which exhibit a kind of roof shape on their upper sides.
  • transverse tension forces occur in practice in the middle region relative to the overall length of the beam. From FIG.
  • Zones 2 subjected to transverse tension also occur at a U-shaped notch in a beam 1 , for insertion of a transversely extending girder 7 .
  • FIG. 8 there is illustrated an addition to the arrangement encountered in practice, which is also illustrated in FIG. 3 .
  • a zone 2 which is subjected to transverse tension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Joining Of Building Structures In Genera (AREA)
US10/239,265 2000-03-21 2001-03-19 Wooden beams with sections that are subjected to transversal tension Expired - Fee Related US6829866B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10013810.1 2000-03-21
DE10013810 2000-03-21
DE10013810A DE10013810B4 (de) 2000-03-21 2000-03-21 Träger aus Holz mit auf Querzug belasteten Abschnitten
PCT/EP2001/003122 WO2001071120A1 (de) 2000-03-21 2001-03-19 Träger aus holz mit auf querzug belasteten abschnitten

Publications (2)

Publication Number Publication Date
US20030029128A1 US20030029128A1 (en) 2003-02-13
US6829866B2 true US6829866B2 (en) 2004-12-14

Family

ID=7635655

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/239,265 Expired - Fee Related US6829866B2 (en) 2000-03-21 2001-03-19 Wooden beams with sections that are subjected to transversal tension

Country Status (9)

Country Link
US (1) US6829866B2 (de)
EP (1) EP1266103A1 (de)
AU (1) AU2001254704A1 (de)
CA (1) CA2403655A1 (de)
CZ (1) CZ20022452A3 (de)
DE (1) DE10013810B4 (de)
NO (1) NO324015B1 (de)
SK (1) SK9632002A3 (de)
WO (1) WO2001071120A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060179741A1 (en) * 2005-02-03 2006-08-17 Thomas Sohm Unknown
US20070130852A1 (en) * 2003-12-19 2007-06-14 Sfs Intec Holding Ag Wood wall construction made of wooden beams
US20080034928A1 (en) * 2006-06-21 2008-02-14 Shaw Shyan Sheu Tool member having indicator device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60223808T2 (de) * 2002-09-24 2008-10-30 The Procter & Gamble Company, Cincinnati Absorbierender Artikel mit einem aus einer saugfähigen thermoplastischen Zusammensetzung bestehendem Element
DE20315202U1 (de) 2003-10-02 2003-12-18 Abc Verbindungstechnik Gmbh & Co. Kg Schraubenelement, insbesondere zur Querzug- und/oder Querdruckverstärkung von Holzbauteilen
DE102007029255A1 (de) 2007-06-15 2008-12-18 Würth, Adolf Schraube und ihre Verwendung

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE236563C (de)
US2342916A (en) * 1942-10-26 1944-02-29 John F Blaski Arched wooden rafter
US3605360A (en) * 1969-04-24 1971-09-20 Skuli Walter Lindal Prestressed vertically laminated beam of wood
US4501102A (en) * 1980-01-18 1985-02-26 James Knowles Composite wood beam and method of making same
GB2150969A (en) 1983-12-06 1985-07-10 Dinardo And Partners Restoring and strengthening of timber components
US4648225A (en) * 1985-06-07 1987-03-10 Waddell Thomas T Split bending crown molding
US4741144A (en) * 1985-10-31 1988-05-03 Andre Graffin Composite structural beam
US5048256A (en) * 1989-09-27 1991-09-17 A/S Selvaagbygg Composite beam
US5050366A (en) * 1987-11-11 1991-09-24 Gardner Guy P Reinforced laminated timber
USRE35327E (en) * 1991-07-03 1996-09-10 Sing; Peter Method of converting logs and resultant product
US5565057A (en) * 1993-11-05 1996-10-15 Globe Machine Manufacturing Company Web feed conveyor assembly in a wooden I-beam assembly machine and web feeding method
US5806266A (en) * 1995-07-07 1998-09-15 Wilian Holding Company Beam member having an adjustable curvature
US5832681A (en) * 1996-08-07 1998-11-10 Flintwood Products Mull post
WO1998057005A1 (de) 1997-06-09 1998-12-17 Sfs Industrie Holding Ag Koppelpfette aus zwei oder mehreren, in längsrichtung einander überlappend aneinander anschliessenden holzbalken sowie befestigungselement zum verbinden von jeweils zwei einander überlappenden endbereichen von holzbalken zum einsatz bei einer koppelpfette
US5852909A (en) 1994-03-01 1998-12-29 The United States Of America As Represented By The Secretary Of Agriculture Localized notch reinforcement for wooden beams
DE19741735A1 (de) 1997-09-22 1999-04-15 Sfs Ind Holding Ag Koppelpfette aus wenigstens zwei aneinander anschließenden Holzbalken sowie Befestigungselement zum Einsatz bei dieser Koppelpfette
US6325583B1 (en) * 1997-09-22 2001-12-04 Sfs Industrie Holding Ag Screw for fixing wooden laths on a roof substructure or a wall foundation
US6588161B2 (en) * 2001-04-27 2003-07-08 William Harry Smith Laminated construction elements and method for constructing an earthquake-resistant building

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2451639B2 (de) * 1974-10-30 1979-08-23 Hans 8501 Behringersdorf Binker Verfahren zum Restaurieren von Holzbalken
DD236563A1 (de) * 1985-04-26 1986-06-11 Bauakademie Ddr Verbindungselement fuer plattenfoermige teile

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE236563C (de)
US2342916A (en) * 1942-10-26 1944-02-29 John F Blaski Arched wooden rafter
US3605360A (en) * 1969-04-24 1971-09-20 Skuli Walter Lindal Prestressed vertically laminated beam of wood
US4501102A (en) * 1980-01-18 1985-02-26 James Knowles Composite wood beam and method of making same
GB2150969A (en) 1983-12-06 1985-07-10 Dinardo And Partners Restoring and strengthening of timber components
US4648225A (en) * 1985-06-07 1987-03-10 Waddell Thomas T Split bending crown molding
US4741144A (en) * 1985-10-31 1988-05-03 Andre Graffin Composite structural beam
US5050366A (en) * 1987-11-11 1991-09-24 Gardner Guy P Reinforced laminated timber
US5048256A (en) * 1989-09-27 1991-09-17 A/S Selvaagbygg Composite beam
USRE35327E (en) * 1991-07-03 1996-09-10 Sing; Peter Method of converting logs and resultant product
US5565057A (en) * 1993-11-05 1996-10-15 Globe Machine Manufacturing Company Web feed conveyor assembly in a wooden I-beam assembly machine and web feeding method
US5852909A (en) 1994-03-01 1998-12-29 The United States Of America As Represented By The Secretary Of Agriculture Localized notch reinforcement for wooden beams
US5806266A (en) * 1995-07-07 1998-09-15 Wilian Holding Company Beam member having an adjustable curvature
US5832681A (en) * 1996-08-07 1998-11-10 Flintwood Products Mull post
WO1998057005A1 (de) 1997-06-09 1998-12-17 Sfs Industrie Holding Ag Koppelpfette aus zwei oder mehreren, in längsrichtung einander überlappend aneinander anschliessenden holzbalken sowie befestigungselement zum verbinden von jeweils zwei einander überlappenden endbereichen von holzbalken zum einsatz bei einer koppelpfette
DE19741735A1 (de) 1997-09-22 1999-04-15 Sfs Ind Holding Ag Koppelpfette aus wenigstens zwei aneinander anschließenden Holzbalken sowie Befestigungselement zum Einsatz bei dieser Koppelpfette
US6325583B1 (en) * 1997-09-22 2001-12-04 Sfs Industrie Holding Ag Screw for fixing wooden laths on a roof substructure or a wall foundation
US6588161B2 (en) * 2001-04-27 2003-07-08 William Harry Smith Laminated construction elements and method for constructing an earthquake-resistant building

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Blass & Steck, Querzugverstärkungen . . . (English: Transverse Reinforcement . . . ) Apr. 1999, pp. 44-49.
Möhler & Siebert, Untersuchungen . . . (English: Investigations . . . ) Jun. 1984, pp. 388-393.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070130852A1 (en) * 2003-12-19 2007-06-14 Sfs Intec Holding Ag Wood wall construction made of wooden beams
US20060179741A1 (en) * 2005-02-03 2006-08-17 Thomas Sohm Unknown
US20080034928A1 (en) * 2006-06-21 2008-02-14 Shaw Shyan Sheu Tool member having indicator device

Also Published As

Publication number Publication date
US20030029128A1 (en) 2003-02-13
SK9632002A3 (en) 2003-02-04
NO20024457D0 (no) 2002-09-18
WO2001071120A1 (de) 2001-09-27
DE10013810A1 (de) 2001-10-04
AU2001254704A1 (en) 2001-10-03
DE10013810B4 (de) 2004-08-12
CZ20022452A3 (cs) 2003-01-15
NO20024457L (no) 2002-09-23
CA2403655A1 (en) 2002-09-18
NO324015B1 (no) 2007-07-30
EP1266103A1 (de) 2002-12-18

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Effective date: 20121214